George w



(No Model.)

G. W. TUBES.

STOVE PIPE THIMBLE.

N0. 279,2 5. Paiented June 12,1888.

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UNITED STATES PATENT OFFICE.

GEORGE TV. TUBES, OF PHCENIX, NEW YORK.

STOVE-PIPE THIMBLE.

SPECIFICATION forming part of Letters Patent No; 279,205, dated June 12, 1883.-

To all whom, it may concern.- Be it known that I, GEORGE W. TUBBs, of Phoenix, in the county of Oswego, in the. State of New York, hat e invented new and useful Improvements in Stove-Pipe Thimbles, of which'the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

This invention relates to that class of stovepipe thimbles which are composed of telescopic sections adapted to be extended or contracted in length to conform to the thickness of the wall or ceiling through which they areto reach.

The invention consists in improved means for adjustably retaining the thimble in its required length, as hereinafter fully described, and specifically set forth in the claims.

The invention is fully illustrated in the annexed drawings, wherein Figure I is a side view of my improved stove-pipe thimble. Fig. II is a longitudinal section of the same. Fig. III. is an end view, and Fig. IVa transverse section on line at m, Fig. II.

Similar letters of reference indicate corresponding parts.

A and A are two cylinders adapted to slide telescopically one over the other, and provided at their respective outer ends with a collar, B, by which the thimble embraces opposite sides of the partition or ceiling through which the thimble extends. The outer cylinder, A, I form with a series of circumferential creases or grooves, a a, on the inside. The inner cylinder, A, I provide with spring-catches b, in the form of spring-metal strips, fastened at one end to the interior of said cylinder, and having near their free end a short crimped or doubled portion, 0, forming an outward-projecting lug, which protrudes through an aperture in the side of the cylinder A, and is adapted to enter one of the grooves a of the outer cylinder, A, the extremity of said springplate extending over the end of the cylinder A and part way into the joint betweenthe two cylinders, so as to retain said springplate in position.

Application filed April 16. 1883. (No model.)

The intermediateportion of the spring-plate has sufiicient tension to hold the lug c engaged with the groove a with sufficient force to prevent the two cylinders from slipping tele scopically by their own weight; but it has at the same time sufficient elasticity to allow the lug to spring out of the groove and automati cally release the two cylinders when pressure is applied against opposite ends of the thimbles for contracting the same, or when manual force is exerted for drawing the two cylinders in opposite directions for extending the length of the thimble.

It will thus be observed that by the described construction and combination of parts I obtain a stove-pipe thimble which is simple in construction and very convenient and efficient in its operation.

Having described my iiwention, what I claim as new is r I. The cylinder A, provided internally with circumferential grooves a a, in combination with the cylinder A, provided with the spring catches 11, substantially as and for the purpose set forth.

2. In combination with the cylinder A, provided with the circumferential grooves a a, the cylinder A, sliding telescopically in the cylinder A, and the spring-plates b, fastened at one end to the interior of the cylinder A,

and having its free end extended over the end of, the same and into the joint between the two cylinders, and formed iutermediately of its length with the outward-projecting doubled portion a, protruding through the side of the cylinder A, substantially as described and shown.

In testimony whereof Ihave hereunto signed 

